Continuous heating-furnace.



A. W. GRIFFITH. CONTINUOUS HEATING PURNAGE. APYLIOATION FILED SEPT. 22,1909.

1,029,605., Patented Jun@ 18, 1912.

2 SHEETS-SHEET l.

A. W. GRIFFITH.

CONTINUOUS IEA"1Il\TGI FURNAUE. APPLICATION IILBD SEM'. 22, 1909.

Patented June `18, 19,12.

2 SHEETS-SHEETZ.

` WWNESSES INVENTOR awww@ ASA W. GRIFFITH, YOUNGSTOWN, OHIO.

CONTINUOUS HEATNG-FUBNACE.

' Specication of Letters Patent.

Patented June 18, 1912.

Application tiled. September 22, 1909. Serial No. 519,068.

To all 'whom it may concern:

Be it knownthat I, ASA W. GRIFFITH, of Youngstown, in the county ofMahoning and Stateof Ohio, have invented'certain new and usefulImprovements in Continuous portion of the combustion chamber.

My of coal tired heating furnaces and more particularly relates t-o theconstruction of the combustion chamber of such furnaces.

The object of the invent-ion is to provide a furnace having improvedmeans by which the fuel is uniformly distributed in the combustionchamber and by 'which ashes and 'clinkers are removed from thecombustion chamber.

A further object lf. the invention is to provide means by which the roofof the furnace is protected and unburned gases escaping from the fuelbed are burned.

vA. further object' of the invention isto provide an improvedconstruction of the ash hopper by which loss of Aunb'urned coal isprevented. i A still further object of my invention is to provide animproved twyer or wind box 4u on water cooled pipes Vwith the oppositeends'of the bricks formbottom of. the furnace' opposite the chargingdoor is provided with -a water cooled sole vblanks heated in the f ture.

construction by which fusingI of clinkers to the furnace wall isprevented and overcome.-

In the drawings '2 represents the discharge end of a coal ltiredhorizontal heating -furnace having a. roof 3 which is suspended 4 whichengage ing the roof. The

plate 5 onwhich the furnace are moved through the discharge door of thefurnace.

. 'At one end of the furnace 2 is' a rectangw' lar combustion chamber 6which as shown extends entirely across the width tof the furnace thecombustion .cliambebeing built vinvention'relates to the construction cfthe `furnace struc' The lower` end :ofY the combustion p chamber 6 iscarried upon asuitable frame work '7 whichin. turn is supported uponposts or columns 8, so as to give access to the interior vof the bottomportion of the chamber 6 from all sides. of the chamber 6 terminates ina downwardly and inwardly sloping ash hopper 9, the slopingsidesvpreven'ting passage of unburned fuel into the water sealed ash pit10. The lower end of the ash hopper 9 eX- tends downwardly below thelevel of the Water overfiow outlet 12 in the ash pit 10, so as to form awater seal when the furnace is in operation. L Located in the roof abovethe central portion of the combustion chamber 6 is a rectangular opening13 which communicates with the,

of the furnace. At one side of and near the upper end of the chute 14isa transverse opening 15 through' one side wall which communicates withthe lower smaller end of the fuel hopper 16. The transversely extendingopening 15 is provided with a longitudinal movable charging plate 17which is adjustably secured to an actuating The lower endcharging chute14 through which .y fuel 1s charged into the combustion chamber device17, the actuating device being connected to any suitable driving motor.

The fuel charging mechanism issupported upon beams 18 which .are carriedon suitable supports located at opposite ends of the combustion chamber.

The top of the upper end of the opening 144 is yprovided wit-lr a seriesof covers 19 which are removably secured in place so as to give accessto the interior of the combustion chamber through the opening 14:

whenever found necessary or deslrable.

The ends of the roof bricks of the fur nace defining the width of theopening 13 are carried on water cooled pipes 20; which serve to lengthenthe life' of the roof at this point by reason of the cooling effect o fthe water. I

Located above the ash pit 10 1n tlie lower end of the combustion chamber6 is a twyer rbox or wind box 21, the sloping top surfaces of which areprovided with a series of rectangular openings 22 through which airunder pressure'is delivered to `the -fuel bed in the combustionchamberand located in the bridge wall 23 of the furnace is a reef` tanlar wind box 24 having openings 25411() lea ing therefrom at suitableintervals in the top surface of thegbridgemyvall 23. The

` apparent to those skilled in the art.

copies of this patent may be obtained fo'r ve cents each, Washington, D.G

in the combustion chamber.' sure is supplied to the under o ffburningfuel from the twyer box'21, ex-

wind boxes `21 and 24 are connected to a supply\ ofair under erablybeing preheated.

A-t the upper outer end of the combustion chamber v6 is a pipe 26 havinga series of branches 27 which communicate with open? ings 28 extendingthrough the end wall of the furnace at a point slightly belo'w the innersurface of the roof. The pipe 26 e011-, kiieets with a' source ofpreheated air to supply air to the furnace immediately below the roof soas to complete the combustion of unburned also serves to protect theroof 'and prevent its becoming excessively heated.

Suitable plug holes 29 are provided in the combustionchamber for cuttingor slicing the fire and breaking up clinkers during thefiringoperations. I ,In the operation of furnaces built in accordancewith my improved construction, the coal is fed from the hopper 16into-the chute 14 by means of the pushers 17. The coal or other fuelthenY drops vertically into the cent-ral portion of the chamber where itbecomes'evenly distributed over the surface ofthe combustion chamber.The coal being burned is supported on the ashes whichrest in the ash pit10. 'As the ashes and clinkers collect in the furnace, they are rakedout through the ash pit from all sides `of the combustion chamber, inthis way causing an even descent of` the column of burning fuel Airunder pressi`de of thebed tending across 'the width'of -the furnacethrough the air holes 22. Air is also provided,y preferably in apreheated condition, to the under side of the gases passing into 'thefurnace 2 from t-he wind box24L through the openings 25 in the bridgewall 23.- Preheated air 1s also led 'into the upper portion of thefurnace through the openings 28 and by passing along the underside `ofthe furnace roof 1n a thin sheet, efficiently protects the furnace rooffrom excessive heat and also causes the combustion of any unburned gasesescaping upwardly, vfrom the 'combustion chamber,'and in this waygreatly increases the life and efficiency of the furnace.

The advantages of myv invention will be The apparatus is simple andeasily kept in repair. The life of such furnaces is very greatlylengthened while theheating capacity of the furnace is largelyincreased.

Modifications in the construction and arrangement of the parts may bemade without departing from the spirit and scope of my invention asdefined in the claims.

I claiinz. a

1. A. heating furnace including an upright pressure, the air `prefgasesin the top of the-furnace and g rate sides,

' with the c combustion' chamber, a substantially horizontal heatingchamber leading from the up' per portion "of the combustion chamberthroughout the width thereof, and a wind box in the lower chambersubstantially midway between the front and back thereof and below theheating c of the combustion chamber, said wind box having upwardlyconverging front and rear perforatesides, the roof of the combustionchamber havin acharging opening therethrough exten ing the f full 'widthof said chamber and located in alinement with the -wind box,substantially as described.

y2. A heating furnace including an upright combustion chamber, asubstantially horizontal heating chamber leading from the upper portionof the combustion chamber throughout the width thereof, a Wind box inthe lower portion of thecombustion chainber substantially midway betweenthe front and back thereof and. below the heating chamber and extendingthe full width of the combustion chamber, said wind box having upwardlyconverging front and rear perfothe roof of the combustion chainberhaving a charging opening therethrough extending the full lwidth of saidchamber and located in alinement with the wind box,

ortion of the combustion hamber and extending the full width f and meansfor maintaining ai sheet of air against the under side of the roof ofthe furnace, substantially as described.

3. A heatin .furnace including an upright combustion chamber, asubstantially horizontal heating chamber leading from the `upper portionof the combustion chamber throughout the width thereof, a wind'box 7 inthel lower portionvof the combustion chamber substantially 'midwaybetween the front. and back thereof andv below 'the heating chamber andextending the full widthl ofv 'the combustion chamber, said wind boxhav- .ing

upwardly converging front and rear perforate sides, the roof of thecombustion chamber. having through extending the full width of saidchamber and located in alinement with the wind box, a charging chutecommunicating" arging opening 'throughout the length thereof, a. feedhopper at one side of the chute, there being a passage leading from thehopper through one sideof the chute throughout the horizontal rlengththereof, anda mechanical charger working in the passage, substantiallyas described.

In testimony whereof, I have hereunto set. my hand.

ASA w. GRIFFITH.'

Witnesses: v

JOHN HULST, I A. C.' Coox.

by addressing the "Commissioner of Patents, i,

a charging opening there-

